Post on 14-Mar-2023
CHEMISTRY
BOOKS MARVEL CHEMISTRY (HINGLISH)
STATES OF MATTER : GASES AND LIQUIDS
Multiple Choice Questions Standard Level
1. Kinetic energy of molecules is highest in
A. Gases
B. Solids
C. Liquids
D. Solutions
Answer: A
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2. Which is distilled �rst ?
A. Liquid
B. Liquid
C. Liquid
D. Liquid
Answer: A
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H2
CO2
O2
N2
3. At ordinary temperature and pressure, chlorine is because a gas,
bromine is a liquid and iodine is a solid because
A. the speci�c heat is in the order l2 > Br2 > Cl2
B. intermolecular forces among molecules of chlorine are weakest
and those of iodine the strongest
C. the order of density
D. the order of stability si
Answer: B
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l2 > Br2 > Cl2
l2 > Br2 > Cl2
4. Which one of the following is the correct order of interactions ?
A. Covalent hydrogen bonding van der Waals dipole-
dipole
B. van der Waals hydrogen bonding dipole-dipole
covalent
C. van der Waals dipole -dipole hydrogen bonding
covalent
< < <
< < <
< < <
D. Dipole-dipole van der Waals hydrogen bonding
covalent
Answer: B
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< < <
5. In which of the following set of molecules is the order of boiling
point incorrect?
A. Xe Ar He
B. HF HCI HBr
C.
D.
Answer: B
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> >
> >
H2 > H2Se > H2S
C3H8 > C2H6 > CH4
6. What is the dominant intermolecular forces or bond that must be
overcome in converting liquid to gas ?
A. Dipole -dipole interaction
B. Covalent bonds
C. London dispersion forces
D. hydrogen bonding
Answer: D
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CH3OH
7. Which of the following has the lowest boiling point ?
A. Liquid
B. Liquid
C. Liquid
H2
CO2
O2
D. Liquid
Answer: A
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N2
8. At ordinary temperature and pressure, chlorine is because a gas,
bromine is a liquid and iodine is a solid because
A. the speci�c heat is in the order
B. intermolecular forces among molecules of chlorine are weakest
and those of iodine the strongest
C. the order of density
D. the order of stability si
Answer: B
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l2 > Br2 > Cl2
l2 > Br2 > Cl2
l2 > Br2 > Cl2
9. Which factor is most responsible for the increase in boiling points of
noble gases from He to Xe?
A. Decrease in I.E.
B. Monoatomic noture
C. Decrease in polarisability
D. Increase in polarisability
Answer: D
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10. Type of forces between molecules of are
A. Dipole -dipole interaction
B. Dispersion forces
C. H-bonding
C6H6
D. Dipole induced -dipole forces
Answer: B
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11. Which of the following exhibits the weakest intermolecular forces?
A.
B. HCI
C. He
D. O
Answer: C
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NH3
H2
12. In group 16 which hydride has higest boiling point ?
Gaseous State
A. O
B. S
C.
D. Te
Answer: A
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H2
H2
H2Se
H2
1. Dimensions of pressure are same as that of
A. Energy
B. Force
C. Energy per unit volume
D. Force per unit volume
Answer: C
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2. Poise stands for
A. 1 dyne cm
B. 1 dyne sec
C. e.s.u. cm
D. erg sec
Answer: B
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sec− 2
cm− 2
1018
10− 7
3. Which of the following statements is not correct about the three
states of matter, i.e., solid, liquids and gas?
A. Molecules of a solid possess least kinetic energy whereas those
of a gases possess highest kinetic energy
B. The desity of solid is highest whereas that of gases is lowest
C. Gases like liquids possess de�nite volumes
D. Molecules of a solid possess vibratory motion
Answer: C
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4. Which of the following is true about gaseous state?
A. Thermal energy = Molecular attraction
B. Thermal energy Molecular attraction
C. Thermal energy Molecular attraction
D. Molecular forces Those in liquids
> >
< <
> >
Answer: B
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5. C rise in temperature is equal to a rise of
A. F
B. F
C. F
D. F
Answer: B
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1∘
1∘
9/5∘
5/9∘
33∘
6. At what temperature will both the Celsius and Fahrenheit scales read
the same value?
Boyle S Law Charles Law Gay Lussacs Law And Avogadros Law
A. C
B. F
C. C
D. C
Answer: C
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0∘
32∘
−40∘
40∘
1. When gases are heated from to C at constant pressure their
volumes
A. increase by the same megnitude
B. become double
C. increase in the ratio of their molecular masses
20∘ 40∘
D. increase but to di�erent extent
Answer: D
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2. Aqueous tension of water depends on
A. the amount of the water taken
B. the temperature only
C. both on the amount of water and temperature
D. neither the temperature nor the amount of water but on certain
other factors
Answer: B
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3. The ratio of the partical pressure of a gaseosy component to the
total vapour pressure of the mixtuer is equal to :
A. mass of the component
B. mole fraction of the component
C. mass % of the component
D. molecular mass of the component
Answer: B
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4. Dalton's law of partial pressures will not hold good for which of the
following ?
A.
B.
C.
H2 + O2 + CO2
N2 + HBr + Cl2
Cl2 + NH3 + HBr
D.
Answer: C
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NH3 + O2 + Cl2
5. The rate of di�usion of a gas is proportional to
A.
B.
C.
D.
Answer: A
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p
√d
p
d
√p
d
√p
d
6. Which of the following pairs will e�use at the same rate through a
porous plug .
A. CO,
B.
C.
D. NO,
Answer: D
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NO2
NO2, CO2
NH3, PH3
C2H6
7. Which of the following gas will have highest rate of di�usion ?
A.
B.
C.
NH3
N2
CO2
D.
Answer: A
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O2
8. Which of the following statement is false ?
A. The product of pressure and volume of �xed amount of a gas is
independent of temperature
B. Molecules of di�erent gases have the same K.E. at a given
temperature
C. The gas equation is not valid at high pressure and low
temperature
D. The gas constant per molecule is known as Boltzmann constant
Answer: A
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9. Air at sea level is dense. This is a practical application of
A. Boyle's law
B. Charle's law
C. Avogadro's law
D. Dalton's law
Answer: A
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10. The slope of the plot between and at constant temperature is
A. zero
B. 1
pV p
C.
D.
Answer: A
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1/2
1/√2
11. Hydrogen di�uses six times faster than gas . The molar mass of
gas is
A. 72
B. 6
C. 24
D. 36
Answer: A
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A
A
12. The ratio of the rate of di�usion of helium and methane under
indentical conditions of pressure and temperature will be
A. 4
B. 2
C. 1
D. 0.5
Answer: B
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13. Steam distillation is based on
A. Boyle's law
B. Charle's law
C. Dalton's law of partial pressures
D. Avogadro's law
Answer: C
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14. Graph between and at constant temperature is
A. straight
B. curved increasing
C. straight line with slope
D. parabolic curve decreasing
Answer: D
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p V
15. In order to increase the volume of a gas by , the pressure of
the gas should be
A. decrease by 10%
B. decreased by 1%
C. increased by 10%
D. decreased by 1%
Answer: A
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10 %
16. Which one of the following plot will be a hyperbola at constant
temperature ?
A. P vs 1/V
B. PV vs P
C. V vs P
D. V vs PV
Answer: C
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17. The mountaineers carry oxygen gas cylinders with them while
climbing high mountains . Give reasons.
A. Density of air is high at the altitudes
B. Density of air is low at the altitudes
C. Air is less pure at the altitudes
D. Air contains no oxygen at the altitudes
Answer: B
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18. If is the volume of a given mass of gas at at a constant
pressure then according to Charles' law, the volume at will be
.
A.
B.
C.
D.
Answer: D
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V0 273K
10∘C
______________
10V0
(v0 + 10)1
273
V0 +10
273
V0283
273
19. The correct representation of Charle's law is given in
20. At of the following does not showexpliently the relationship
between Boyle's law and Charles'law?
A.
B. PV=K
C.
D.
Answer: D
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=P1
P2
T1
T2
=P1
P2
V1
V2
× =V2
V1
P1
P2
T2
T1
21. If the absolute temperature of a gas is doubled and the pressure is
reuced to one-half, the volume of the gas will
A. Remain unchanged
B. Be doubled
____________
C. Increase four-fold
D. Be reduced to
Answer: C
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1/4th
22. The molar volume of is maximum at
A. STP
B. C and 2.0 atm
C. C and 1 atm
D. C and 2 atm
Answer: C
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CO2
0∘
127∘
273∘
23. There is 10 litre of a gas at STP Which of the following new
conditions keep the volume constant?
A. 273K and 2atm. Pressure
B. C and 2 atm . Pressure
C. C and 0.5 atm. Pressure
D. C and 0.0 atm. Pressure
Answer: B
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273∘
546∘
0∘
24. Five grams each of the following gases at and 750 mm
pressure are taken. Which of them will have the least volume ?
A. HF
B. HCI
C. HBr
87∘C
D. HI
Answer: D
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25. According to Charles' law, at constant pressure, 100 ml of a given
mass of a gas with rise in temperature will become ( =
0.00366)
A. 100.0366
B. 99.9634
C. 103.66
D. 100.366
Answer: C
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10∘C1
273
26. A sealed tube which can withstand a pressure of 3 atmosphere is
�lled with air at and 760 mm pressure. Find the temperature
above which it will burst.
A. C
B. C
C.
D. C
Answer: B
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27∘C
81∘
627∘
900∘C
1173∘
27. of oxygen at were cooled to without change
in pressure. The contraction in volume will be as per Charle's law?
A.
400cm3 27∘C −3∘C
30cm3
B.
C.
D.
Answer: B
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40cm3
44.4cm3
360cm3
28. An electron tube was sealed o� during manufacture at a pressure
of mm of mercury at Its volume is 100 . The
number of molecules that remain in the tube is
A.
B.
C.
D.
Answer: A
1.2 × 10− 7 27∘C. cm3
6.02 × 1014
8.2 × 6.02 × 1023
24.6 × 106
8.2 × 30 × 6.02 × 1023
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29. 16 g of oxygen and 3g of hydrogen are mixed and kept at of
Hg pressure and . The total volume occupied by the mixture will
be nearly .
A. 22.4 L
B. 33.6 L
C. 448 L
D. 44800 mL
Answer: D
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760mm
0∘C
_______________
30. 2.8 g of 0.40 g of and 6.4 g of are placed in a container of
1.0 L capacity at C. The total pressure in the container is
N2 H2 O2
27∘
A. 6.15 atm
B. 12.3 atm
C. 1.123 atm
D. 24.6 atm
Answer: B
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31. One litre of a gas weights 2 g at 300 K and 1 atm pressure. If the
pressure is made 0.75 atm at which of the following temperature will
one litre of the same gas weight one gram ?
A. 450 K
B. 600 K
C. 800 K
D. 900 K
Answer: A
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32. The closed containers of the same capacity and at the same
temperature are �lled with 44 g of in one and 44 g of in the
other . If the pressure of carbon dioxide in the second container is 1
atm , then pressure of hydrogen in the �rst container would be :
A. 1 atm
B. 10 atm
C. 22 atm
D. 44 atm
Answer: C
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H2 CO2
33. V vs T curves at constant pressure and for an ideal gas are
shown below
Which is correct ?
A.
B.
C.
D. All of the above
Answer: B
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P1 P2
P1 > P2
P1 < P2
P1 = P2
34. Containers A,B and C of equal volume contain oxygen neon and
methane respectively at the same temperature and pressure . The
correct increasing order of their masses is [ C=12, Ne =20 H=1]
A.
B.
C.
D.
Answer: D
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A < B < C
B < C < A
C < A < B
C < B < A
35. Pressure remaining the same, the volume of a given mass of an
ideal gas increases for every degree centigrade rise in temperature by
de�ne fraction of its volume at
A. C
B. Absolute zero
C. Its critical temperature
D. Its Boyle's temperature
Answer: A
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0∘
36. At constant temperature, in a given mass of an ideal gas -
A. The ratio of pressure and volume always remains constant
B. Volume always remains constant
C. pressure always remains constant
D. The product of pressure and volume always rmains constant
Answer: D
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37. 500 mL of nitrogen at is cooled to at the same
pressure. The new volume becomes
A. 326.32 mL
B. 446.66 mL
C. 546.32 mL
D. 771.56 mL
Answer: B
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27∘C −5∘C
38. 600 cc of a gas at a pressure of 750 mm is compressed to 500 cc.
Taking the temperature to remain constant, the increase in pressure is
A. 150 mm
B. 250 mm
C. 350 mm
D. 450 mm
Answer: A
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39. At and 730 mm pressure, 380 mL of dry oxygen was collected.
If the temperature is constant, what volume will be oxygen occupy at
pressure ?
A. 365 mL
B. 465 mL
C. 565 mL
D. 665 mL
Answer: A
25∘C
760mm
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40. Which of the following volume-temperature plots
represents the behaviour of of an ideal gas at the atmospheric
pressure?
A.
B.
C.
D.
(V − I)
1mole
Answer: C
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41. At , a ges is compressed to half of its volume . To what
temperature it must now be heated so that gas occupies just its
original volume ?
A. C
B. C
C. C
D. C
Answer: B
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27∘C
54∘
327∘
600∘
427∘
42. The temperature of a certain mass of a gas was increased from
C to C at constant pressure the volume of the gas
A. will remain the same
B. will decrease by 1/273 of its volume at 273 K
C. will increase by 1/273 of its volume at C
D. will increase by 1/273 of its volume at C
Answer: C
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29∘
30∘
29∘
30∘
43. If represent pressure, volume and temperature of the
gas, the correct representation of Boyle's law is
A. (at constant P)
B. PV=RT
P , V , and T
V ∞1
T
C. (at constant T)
D. PV=nRT
Answer: C
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V ∞1
P
44. Air at sea level is dense. This is a practical application of
A. Boyle's law
B. Charle's law
C. Avogadro's law
D. Dalton's law
Answer: A
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45. If gas at is expanded to at constant , then
what is the �nal pressure
A.
B.
C.
D. None of these
Answer: A
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20cm3 1atm 50cm3 T
20 ×1
50
1 × × 501
20
1 × 20 ×1
50
46. Which of the following graph represents Boyle's law ?
A.
B.
C.
D.
Answer: B
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47. At constant pressure , the volume of �xed mass of an ideal gas is
directly proportional to
A. Absolute temperature
B. Degree centigrade
C. Degree Fahrenheit
D. None of these
Answer: A
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48. Which of the following expression at constant pressure represents
Charles's law?
A.
B.
C.
D.
V ∞1
T
V ∞1
T 2
V ∞T
V ∞d
Answer: C
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49. Use of hot air ballons in sports and meteorological observations in
an application of
A. Boyle's law
B. Newtonic law
C. Kelvin's law
D. Charle's law
Answer: D
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50. A certain sample of gas has a volume of litre measured at
pressure and . At the same pressure but at , its volume will
be
A. 0.4 litres
B. 0.8 litres
C. 27.8 litres
D. 55.6 litres
Answer: A
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0.2 1atm
0∘C 273∘C
51. One gram mole of a gas at NTP occupies 22.4 L. This fact is derived
from
A. Dalton's theory
B. Avogardo's law
C. Berzelius hypothesis
D. Law of gaseous volume
Answer: B
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52. The density of a gas at and is . Pressure remaining
constant, at which of the following temperture will its density become
?
A. C
B. C
C. 400 K
D. 300 K
Answer: C
27∘C 1atm d
0.75d
20∘
30∘
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53. Equal volumes of gases at the same temperature and pressure
contain equal number of particles. This statement is a direct
consequence of
A. Avogadro's law
B. Charle's law
C. Ideal gas equation
D. Law of partial pressure
Answer: A
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54. 4.4 g of a gas at STP occupies a volume of 2.24 L. The gas can be :
A.
B. CO
C.
D.
Answer: D
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O2
NO2
CO2
55. The density of is 16 at STP. At what temperature (in ) its
density will be 14 ? Consider that the pressure remais constant.
A. C
B. C
C. C
D. C
O2 . ∘ C
50∘
39∘
57∘
43∘
Answer: B
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56. 500mL of contains molecules at STP. How many
molecules are present in 100 mL of at STP?
A.
B.
C.
D. None of these
Answer: C
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NH3 6.02 × 1023
CO2
6 × 1023
1.5 × 1023
1.2 × 1023
57. If molecular mass of and are 32 and 64 respectively. If one
litre of at and 759mm pressure contains N molecules, the
number of molecuels in two litre of under the same conditions of
temperature and pressure will be:
A. N/2
B. Newtonic law
C. 2 N
D. 4 N
Answer: C
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O2 SO2
O2 15∘C
SO2
58. If pressure becomes double at the same absolute temperature on
, then the volume of becomes
A. 2 L
2LCO2 CO2
Ideal Behaviour And Gas Equation And Deviation From Ideal Behaviour
B. 4 L
C. 25 L
D. 1 L
Answer: D
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1. The gas constant R is a constant
A. only for real gases
B. only for ideal gases
C. both for real and ideal gases
D. nether for real nor for ideal gases
Answer: C
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2. Select one correct statement. In the gas equation,
A. n is the number of molecules of a gas
B. V denotes volume of one mole of the gas
C. n moles of the gas have a volume of the gas
D. P is the pressure of the gas when only one mole of gas is present
Answer: C
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PV = nRT
3. Real gases show deviation from ideal behaviour at low temperature
and high pressure.
A. temperature is low and pressure is high
B. temperature si high and Pressure is low
C. both temperature and pressure are low
D. both temperature and pressure are high
Answer: A
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4. The units of the van der Waals constant are
A. atm
B. atm
C. atm
D. mol
Answer: A
a
L2moL2
L− 2moL− 2
L2moL− 1
L− 1
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5. The units of the van der Waal's constant 'b' are
A. atmoshere
B. joules
C. L
D. mol
Answer: C
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mol− 1
L− 1
6. Inert gases such as heliume behave like ideal gases over a wide range
of temperature .However , they condense into the solid state at very
low temperatures. it indicates that at very low temperature there is a
A. negative deviation
B. positive deviation
C. positive and negative deviation
D. none
Answer: A
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7. Any gas shows maximum deviation from ideal gas behaviour at
A. C and 1 atmospheric pressure
B. C and 2 atmospheric pressure
C. C and 5 atmospheric pressure
D. C and 5 atmospheric pressure
Answer: C
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0∘
100∘
−100∘
500∘
8. Van der Waal's constant 'a' and 'b' are related with _________
respectively.
A. Attractive force and bond energy of molecules
B. Volume and repulsive forces of molecules
C. Shape and repulsive of molecules
D. Attractive forces and volume of the molecules
Answer: D
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9. Van der Waal's equation of state is obeyed by real gases. For n moles
of a real gas the expression will be
A.
B.
( + )( ) = RTp
n
na
V 2
V
n − b
(p + )(V − b) = nRTa
V 2
C.
D.
Answer: D
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(p + )(nV − b) = nRTna
V 2
(p + )(V − nb) = nRTn2a
V 2
10. In van der Waals' equation of state of the gas law the constnat 'b' is
a measure of .
A. intermolecular repulsions
B. intermolecular attraction
C. volume occupied by the molecules
D. intermolecular collisions per unit volume
Answer: C
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11. Molar volume of is maximum at
A. NTP
B. C and 2.0 atm
C. C and 1 atm
D. C and 2 atm
Answer: C
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CO2
0∘
127∘
273∘
12. To raise the volume of a gas by four times the following methods
may be adopted. Which of the method is wrong ?
A. T is doubled and P is also raised by four times
B. Keeping P constant T is raised by four times
C. Temperture is double and pressure is halved
D. Keeping temperature constant pressure is reduced to 1/4 of its
initial value
Answer: A
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13. An cylinder contains of butane gas at and 10
atm pressure It was leaking and its pressure fell down to 8 atm
pressure after one day Calculate the amount of leaked gas .
A. 1 kg
B. 2 kg
C. 3 kg
D. 4 kg
Answer: C
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L. P . G 15kg 27∘C
14. Containers A and B have same gases. Pressure, volume and
temperature of A are all twice that of B, then the ratio of number of
molecules of A and B are
A.
B.
C.
D.
Answer: A
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1: 2
2: 1
1: 4
4: 1
15. For a �xed mass of a gas at constant temperature which of the
following is correct?
A. Plot of V vs P is linear
B. Plot of V vs P is non =linear with intercept zero
C. Plot of PV vs P is linear with a zero slope
D. Plot of PV vs P is linear with positive slope
Answer: C
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16. A pre weighed vessel was �lled with oxygen at N.T.P. and weighted.It
was then evacuated, �lled with at the same temperature and
pressure, and again weighed. The weight of oxygen will be
A. The same as that of the
B. Twice as that of the
C. Half of that of the
D. One-fourth of that of the
SO2
SO2
SO2
SO2
SO2
Answer: C
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17. The correct value of the gas contant R is close to
A. 0,082 L-atm K
B. 0.082 L-atm
C. 0.082 L
D. 0.082 K mol
Answer: B
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K − 1mol − 1
atm − 1Kmol − 1
L1atm − 1
18. Under what conditions will a pure sample of an ideal gas not only
exhibit a pressure of but also a concentration of 1atm 1mollitre− 1
iltre atm
A. At STP
B. When V =22.4 L
C. When T =12 K
D. Impossible under any conditions
Answer: C
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[R = 0.082 mol− 1K − 1]
19. What is the nature of graph of PV versus P for a given mass of a gas
at constant temperature?
A. Parallel to X-axis
B. Parallel to Y-axis
C. Linear with positive slope
D. Linear with negative slope
Answer: A
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20. Ideal gas equation strictly obeys gas laws under all conditions of
A. A few selected experimental conditions
B. All experimental conditions
C. Low pressure alone
D. High temperature alone
Answer: B
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21. In the equation of state of an ideal gas `PV = nRT, the value of
universal gas constant would depend only on :
A. The nature of the gas
B. The pressure of the gas
C. The units of the measurement
D. None of these
Answer: C
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22. Which one of the following is not the value of R ?
A. 1.987 cal
B. 8.3 cal
C. 0.0821 lit
D. 1.987 joules
Answer: A
K − 1mol − 1
K − 1mol− 1
K − 1mol − 1
K − 1mol − 1
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23. S.I. unit of gas constant R is
A. 0.0821 litre atm
B. 2 calories
C. 8.314 joule
D. None of these
Answer: C
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K − 1mole− 1
K − 1mole− 1
K − 1mole− 1
24. If two mole of an ideal gas at occupies a volume of ,
the pressure must be :
A. 2 atm
B. 3 atm
546K 44.8litres
C. 4 atm
D. 1 atm
Answer: A
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25. Volume occupied by an ideal gas at one atmospheric pressure and
is V ml. Its volume at 273 K will be
A. V ml
B. v/2 ml
C. 2V
D. 4V
Answer: A
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0∘C
26. Volume of 0.5 mole of a gas at 1 atm. Pressure and 273 K is
A. 22.4 litres
B. 11.2 litres
C. 44.8 litres
D. 5.6 litres
Answer: B
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27. Pure hydrogen sulphide is stored in a tank of 100 litre capacity at
C and 2 atm pressure. The mass of the gas will be
A. 34 g
B. 340 g
C. 282.4 g
20∘
D. 28.24 g
Answer: C
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28. One litre of a gas weights 2 g at 300 K and 1 atm pressure. If the
pressure is made 0.75 atm at which of the following temperature will
one litre of the same gas weight one gram ?
A. 450 K
B. 600 K
C. 800 K
D. 900 K
Answer: A
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29. A weather balloon �lled with hydrogen at 1 atm and has
volume equal to 1200 litres. On ascending, it reaches a place where
temperture is and pressure is 0.5 atm. The volume of the
balloon is
A. 24000 litres
B. 20000 litres
C. 10000 litres
D. 12000 litres
Answer: B
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27∘C
−23∘C
30. At STP 1g Ca on decomposition gives
A. 22.4 litre
CO3 CO2
B. 2.24 litre
C. 0.224 litre
D. 11.2 litre
Answer: C
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31. Containers A and B have same gases. Pressure, volume and
temperature of A are all twice that of B, then the ratio of number of
molecules of A and B are
A.
B.
C.
D.
Answer: B
1: 2
2: 1
1: 4
4: 1
Watch Video Solution
32. A cylinder of 5 L capacity, �lled with air at NTP is connected with
another evacuated cylinder of 30 L capacity. The resultant air pressure
in both the cylinders will be
A. 10.8 cm of Hg
B. 14.9 cm of Hg
C. 21.8 cm of Hg
D. 38.8 cm of Hg
Answer: A
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33. The pressure and temperature of of carbon dioxide gas are
doubled. Then the volume of carbon dioxide gas would be
4dm3
A. 2
B. 3
C. 4
D. 8
Answer: C
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dm3
dm3
dm3
dm3
34. For gas, the compressibility factor,Z = PV n RT is -
A. Equal to 1
B. Equal to 0
C. Always greater than 1
D. Initially less than 1 and then becomes greater than 1 at high
pressures
H2 /
Answer: C
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35. At lower temperatures all gases show
A. negative deviation
B. positive deviation
C. First positive and then negative deviation
D. First negative and then positive deviation
Answer: D
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36. A gas is said to behave like an ideal gas when the relation =
constant. When do you expect a real gas to behave like an ideal gas ?
pV
T
A. When the temperature is low
B. When both the temperature and pressure are low
C. When both the temperature and pressure are high
D. When the temperature si high and pressure is low
Answer: D
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37. When is deviation more in the behaviour of a gas from the ideal gas
equation ?
A. At high temperature and low pressure
B. At low temperature and high pressure
C. At high temperature and high pressure
D. At low temperature and low pressure
PV = nRT
Answer: B
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38. At which one of the following temperature pressure conditions, the
deviation of a gas from ideal behavior is expected to be minimum?
A. 350 K and 3atm
B. 550 K atm 1 atm
C. 250 K and 4 atm
D. 450 K and 2 atm
Answer: B
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39. Any gas shows maximum deviation from ideal gas behaviour at
A. C and 1 atmospheric pressure
B. C and 2 atmospheric pressure
C. C and 5 atmospheric pressure
D. C and 1 atmospheric pressure
Answer: C
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0∘
100∘
−100∘
500∘
40. A gas deviated from ideal behaviour at a high pressure because its
molecules
A. Have kinetic energy
B. Are bound by covalent bonds
C. Attract one another
D. Show the Tyndall e�ect
Liquefaction Of Gases Critical Teperature Pressure And Volume
Answer: C
Watch Video Solution
1. For gas, the compressibility factor,Z = PV n RT is -
A. Equal to 1
B. Equal to 0
C. Always greater than 1
D. Initially less than 1 and then becomes greater than 1 at high
pressures
Answer: C
Watch Video Solution
H2 /
2. When a compressed gas is allowed to expand through a porous plug
at temperature above its inversion temperature there is
A. a fall in temperature
B. a rise in temperature
C. neither a fall nor a rise in temperature
D. a fall in temperature �rst followed by a rise in temperature
Answer: B
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3. The Joule -Thomson coe�cient for a gas is zero at .
A. Inversion temperature
B. Critical temperature
C. Absolute temperature
D. Below C
Answer: A
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0∘
4. An ideal gas obeying the kinetic theory of gases can be lique�ed if
A. its tempereature is more than critical temperature
B. its pressure is more than critical pressure
C. its pressure is more than at a temperature less than
D. it cannot be liqui�ed at any value of P and T
Answer: D
Watch Video Solution
TC
PC
PC TC
5. At the critical temperature
A. liquid and vapour exist in equilibrium
B. vapour state does not exist at all
C. the meniscus between liquid and vapour disappears
D. the vapour condense into solid
Answer: C
View Text Solution
6. Dominance of strong repulsive forces among the molecules of the
gas ( compressibility factor)
A. depends on Z and indicated by Z=1
B. depends on Z and inddicated by Z 1
C. depends on Z and inddicated by Z 1
D. is independent of Z
Z =
>
<
Answer: B
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7. A gas is liqui�ed
A. above critecal temperature and below critical pressure
B. below critical temperature and above critical pressure
C. below critical tempreature and pressure
D. above critical and pressure
Answer: B
View Text Solution
8. The compressibility factor for an ideal gas is
A. 1.5
B.
C.
D.
Answer: B
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1.0
2.0
∞
9. The compressibility factor of gases is less than unity at .
Therefore,
A. litres
B. litres
C. V=22.4 litres
D. V=44.8 litres
Answer: B
Watch Video Solution
STP
V > 22.4
V < 22.4
Watch Video Solution
10. Dominance of strong repulsive forces among the molecules of the
gas ( compressibility factor)
A. depends on Z and indicated by Z=1
B. depends on Z and inddicated by Z 1
C. depends on Z and inddicated by Z 1
D. is independent of Z
Answer: B
Watch Video Solution
Z =
>
<
11. The temperature at which a real gas obeys the ideal gas laws over a
wide range of pressure is called
A. Critical tempreature
B. Boyle temperature
C. Inversion temperature
D. Reduced temperature
Answer: B
Watch Video Solution
12. The critical temperature of a substance is
A. The temperature above which the substance decomposes
B. The temperature above which a substance can esist only as a gas
C. Melting point of the substance
D. Boiling point of the substance
Answer: B
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13. can be lique�ed at ordinary temperature without the
application of pressure. But cannot be because :
A. Its critical temperature is very high
B. Its critical temperature is low
C. Its critical temperature is moderate
D. Its critical temperature is higher than that of ammonia
Answer: B
Watch Video Solution
NH3
O2
14. At the critical temperature , the substance exists as a
A. Liqued and vapour exist in equilibrium
B. vapour state does not exist at all
C. the meniscus between liquid and vapour disappears
D. the vapour condense into solid
Answer: C
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15. The deviation from the ideal gas behaviour of a gas can be
expressed as
A.
B.
C.
D.
Answer: B
Watch Video Solution
Z =P
VRT
Z =PV
nRT
Z =nRT
V P
Z =VR
PT
16. An ideal gas cannot be liqui�ed because
A. Its critical temperature is always above C
B. Its molecules are relatively smaller in size
C. Its solidi�es before becoming a liquid Forces operating between
its molecule are negligible
D.
Answer: D
Watch Video Solution
0∘
17. Which of the following method is used for liquefaction of gases ?
A. Daltons Method
B. Boyle's Method
C. Linde's method
D. Charle's method
Answer: C
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18. Which set of conditions represent the easiest way to cool a gas ?
A. Low temperature and high pressure
B. High temperature and low pressure
C. Low temperature and low pressure
D. High temperature and high pressure
Answer: A
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19. A gas is liqui�ed
A. above critecal temperature and below critical pressure
B. below critical temperature and above critical pressure
C. below critical tempreature and pressure
D. Above temperature and pressure
Answer: C
View Text Solution
20. Liquefaction of gases is based on the principle of
A. Thermodynamics
B. Inductive e�ect
C. Joule-Thomson e�ect
D. Hyper conjugation
Answer: C
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21. Critical temperature of and are 647 K, 405.6 K,
304.10 K and 1542 K respectively. If the cooling starts from 500 K to
their critical temperature, the gas that lilquie�es �rst is
A.
B.
C.
D.
Answer: B
Watch Video Solution
H2O, NH3, CO2 O2
H2O
NH3
CO2
O2
22. Consider the equation . Which of the following
statements is correct?
Z =PV
RT
Kinetic Theroy Molecule Speeds
A. When Z 1 real gases are easier to compress than the ideal gas
B. When Z=1 real gases get compressed easily
C. When Z 1 real gases are di�cult to compress
D. When Z=1 real gases are di�cult to compress
Answer: C
Watch Video Solution
>
>
1. When a gas is compressed as constant temperature:
A. the speeds of the molecules increase
B. the collisions between the molecules increase
C. the speeds of the molecules decrease
D. the collisions between the molecules decrease
Answer: B
Watch Video Solution
2. According to kinetic theory of gases the root mean square velocity is
directly proportional to
A. T
B.
C.
D.
Answer: C
Watch Video Solution
T 2
√T
1/T
3. Which one of the following relationship is correct ?
A.
B.
C.
D.
Answer: D
Watch Video Solution
PV = kT3
2
K. E. = kT2
3
Z =PV
nRT
(PV ) = k2
3
4. Which of the following is correct relation for root mean square
velocity ?
A.
B.
C.
D.
urms = √8RTπM
urms = √3RTM
urms = √2RTM
urms =3RTM
Answer: B
Watch Video Solution
5. The ratio of root mean square velocity of average velocity of a gas
molecule at a particular temperture is
A.
B.
C.
D.
Answer: A
Watch Video Solution
1.086: 1
1: 1.086
2: 1.086
1.086: 2
6. Which of the following is valid at absolute zero ?
A. Kinetic energy of the gas becomes zero but not the molecular
motion
B. Kinetic energy of the gas becomes zero and the molecular
motion also becomes zero
C. Kinetic energy of the gas decreases but does not become zero
D. None of these
Answer: B
Watch Video Solution
7. The rms speed at NTP of a gas can be calculated from the expression:
A.
B.
C.
D. All of the above
√3P
d
√3PVM
√3RTM
Answer: D
Watch Video Solution
8. Root mean square velocity of a gas molecule is proprotional to
A.
B.
C.
D. m
Answer: C
Watch Video Solution
m1 / 2
m0
m− 1 / 2
9. The ratio among most probable velocity, mean velocity and root
mean velocity is given by
A.
B.
C.
D.
Answer: D
Watch Video Solution
1: 2: 3
1: √2: √3
√2: √3:√8/π
√2:√8/π : √3
10. If represent the speeds on
molecules, then the root mean square speed is
A.
B.
C.
D.
C1, C2, C3…. . n1, n2, n3…. .
n1C21 + n2C
22 + n3C
23 + ⋯
n1 + n2 + n3 + ⋯
(n1C21 + n2C
22 + n3C
23 + ⋯)
1 / 2
n1 + n2 + n3 + ⋯
+ + + ⋯(n1C
21 )
1 / 2
n1
(n2C22 )
1 / 2
n2
(n3C23 )
1 / 2
n3
[ ]
1 / 2(n1C1 + n2C2 + n3C3 + ⋯)
2
(n1 + n2 + n3 + ⋯)
Answer: A
Watch Video Solution
11. Internal energy and pressure of a gas per unit vloume are related as
:
A.
B.
C.
D. P=2E
Answer: A
Watch Video Solution
P = E2
3
P = E3
2
P = E1
2
12. The root mean square velocity of an ideal gas to constant pressure
varies with density ( ) as
A.
B. d
C.
D.
Answer: A
Watch Video Solution
d
d2
√d
1/√d
13. Collision frequency (Z) of a gas at a particular pressure
A. decreases with the rise in temperature
B. increases with the rise in temperature
C. decrease initially and thereafter increases
D. unpredictable
Answer: B
Watch Video Solution
14. The integrated form of Clausius-Clapeyron equation is
A.
B.
C.
D. None of these
Answer: C
Watch Video Solution
=d lnK
dT
ΔH
RT 2
log10 = ( − )K2
K1
ΔH
2.303R
1
T1
1
T2
log10 = ( − )P2
P1
Hvap
2.303R
1
T1
1
T2
15. The Clausius-Clapeyron equation depics
A. the e�ect of temperature on the vapour pressure of a liquid
B. e�ect of pressure on the boilling point of a liquid
C. e�ect of temperature on suface tension of liquid
D. Both (a) and (b)
Answer: D
Watch Video Solution
16. At what temperature will the velocity of be the same as
that of ?
A. 273 K
B. 606 K
C. 303 K
D. 403 K
rms SO2
O2at303K
Answer: B
Watch Video Solution
17. The root mean square velocity of one mole of a monoatomic gas
having molar mass M is . The relation between the average
kinetic energy (E ) of the gas and is
A.
B.
C.
D.
Answer: C
Watch Video Solution
Ur .m .s .
Urms
Urms = √3E2M
Urms = √2E
3M
urms = √2EM
urms = √E
3M
Liquid State Vapour Pressure Surface Tension And Viscosity
18. If a gas expands at constant temperature, it indicates that
A. Kinetic energy of the molecules decrease
B. pressure of the gas increases
C. Kinetic energy of the molecules remains the same
D. number of molecules of the gas increases
Answer: C
Watch Video Solution
1. The correct statement regarding liquid state is
A. A liquid resembles a solid near the melting point of the solid
B. A liquid resembles a gas near the critical temperature of the gas
C. A liquid has short range order and long range disorder
D. All of the above
Answer: D
Watch Video Solution
2. Which one of the following is not correct about boilling and
evaporation ?
A. Evaporation takes place at all temperature whereas boilling takes
place only at one particular temperature
B. Evaporation takes place only from the surface whereas boilling
involves formation of bubbles below the surface
C. Boilling can takes place in closed as well as open vessel whereas
evaporation takes place only in open vessel
D. Boilling point decreases if external pressure is low but
evaporation increases if external pressure is low
Answer: C
View Text Solution
3. At the higher altitudes the boiling point of water lowers because
A. atmosheric pressure is low
B. temperature is low
C. atmoshperic pressure is high
D. None of these
Answer: A
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4. Vapour pressure of a liquid depends upon its
A. the amount on the liqiud taken
B. the temperature of ht liquid
C. both on the amount as well as temperature
D. neither the amount nor the temperature but only on the nature
of the liquid
Answer: B
Watch Video Solution
5. Pressure cooker reduces cooking time because :
A. the heat is more easily distributed
B. the higher pressure tenderizes the food
C. the boiling point of the water inside is elevated
D. a large �ame is used
Answer: C
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6. The unit of surface tension in SI system is
A. dynes
B. ergs/cm
C. joules
D. N
Answer: D
Watch Video Solution
cm− 1
m− 1
m− 1
7. The unit of the coe�cent of viscosity isSI
A. kg
B. kg
C. kg
D. g
Answer: B
Watch Video Solution
s− 1m− 2
m− 1s− 1
cm− 1s− 1
m− 1s− 1
8. With the increasesing molecular weight of a liquid the viscosity
A. decreases
B. increases
C. no e�ect
D. all are wrong
Answer: B
Watch Video Solution
9. What is the dominant intermolecular forces or bond that must be
overcome in converting liquid to gas ?
A. Dipole -dipole interaction
B. Covalent bonds
C. London dispersion forces
D. hydrogen bonding
Answer: D
Watch Video Solution
CH3OH
10. On heating a liquid its surface tension
A. Increases
B. Decreases
C. Remains same
D. Is reduced to zero
Answer: B
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11. The unit of the coe�cent of viscosity is
A. kg
B. kg
C. kg
D. g
Answer: B
Watch Video Solution
SI
s− 1m− 2
m− 1s− 1
cm− 1s− 1
m− 1s− 1
12. Which of the following expressions regarding the unit of coe�cient
of viscosity is not true?
A. Dyne sec
B. Dyne
C. N sec
D. Kg
Answer: B
Watch Video Solution
cm− 2
cm2 sec− 1
m− 2
m( − 1)s− 1
13. Which of the following statements is correct if the intermolecular
forces in liquid are in the order ?
A. B evaporates more readily than A
B. B evaporates less readily than C
C. A and B evaporate at the same rate
A, B and C A < B < C
D. A evaporates more readily than C
Answer: D
Watch Video Solution
14. When the temperature is raise, the viscosity of liquid decreases, this
is because,
A. Decreased volume of the solution
B. Increases in temperature increases the average kinetic energy of
molecules which overcome the attractive forces between them
C. Decreased covalent and hydrogen bond forces
D. Increased attraction between the molecules
Answer: B
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15. Generally liquid drops assume spherical spape because
A. A sphere has maximum surface area
B. A sphere has minimum surface area
C. Sphere is symmetrical in shape
D. None of these
Answer: B
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16. On heating a liquid its surface tension
A. Increases
B. Decreases
C. Remains same
D. Is reduced to zero
Answer: B
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17. The internal resistance of a cell is the resistance of
A. Fluidity
B. Speci�c resistance
C. Viscosity
D. Surface tension
Answer: C
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18. As the temperature rises viscosity of liquids
A. Increase
B. Decreases
C. Remains constant
D. May increases or decreases
Answer: B
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19. Which of the following liquids has the highest viscosity ?
A. Benzene
B. Carbon disulphide
C. Acetone
D. Ethanol
Answer: D
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Higher Level
1. Which of the following expression represents correctly the variation
of density of an ideal gas with change in temperature ?
A.
B.
C.
D.
Answer: A
Watch Video Solution
d2 =P2T1d1
P1T2
d2 =d1T1
T2
d2 =d1T2
T1
d2 =d1P2T2
P1T1
2. The vapour density of a gas (X) is 11.2. The volume occupied by 11.2 g
of this gas at N.T.P. is
A. 1 L
B. 11.2 L
C. 22.4 L
D. 20 L
Answer: B
Watch Video Solution
3. With increase in temperature the di�erence between rms velocity
and average velocity will
A. increase
B. Decreases
C. remain same
D. decrease becoming almost zero at a high temperature
Answer: A
Watch Video Solution
Watch Video Solution
4. The average K.E. of an ideal gas is calories per mole is approximately
equal to
A. three times the absolute temperature
B. absolute temperature
C. two times the absolute temperature
D. 1.5 times the absolute temperature
Answer: A
Watch Video Solution
5. At , the order of mean square velocity of molecules of , ,
, and is
A. HBr
STP H2 N2
O2 HBr
H2 < N2 < O2 <
B.
C.
D.
Answer: B
Watch Video Solution
HBr < O2 < N2 < H2
H2 < N2 = O2 < HBr
HBr < O2 < H2 < H2
6. If the inversion temperature of a gas is , then it will produce
cooling under Joule-Thomson e�ect at
A. 298 K
B. 273 K
C. 193 K
D. 173 K
Answer: D
Watch Video Solution
−80∘C
Watch Video Solution
7. A closed vessel contains equal number of nitrogen and oxygen
molecules at pressure of . If nitrogen is removed from the
system, then the pressure will be:
A. P
B.
C. P/2
D.
Answer: C
Watch Video Solution
Pmm
2P
P 2
8. In which of the following states of matter the average distance
between the molecules lies between cm to cm ?10− 5 10− 7
A. Solid
B. Liquid
C. Gas
D. None
Answer: B
Watch Video Solution
9. Why liquids di�use slowly as compared to gases?
A. the molecules are held together by strong intermolecular forces
B. the molecular of liquids are heavy
C. liquids have de�nite shape
D. the molecules of liquids undergo large number of collisions with
the neighbouring molecules
Answer: D
Watch Video Solution
10. During boiling og a liquid bubbles are formed because
A. the vapour pressure inside the bubbles is equal to the
atmospheric pressure
B. the vapour pressure inside the bubbles is slightly greater than
the atmospheric pressure
C. the vapour pressure inside the bubbles is slightly greater than
the atmospheric pressure
D. the dissolved air gets entrapped which is being expelled
Answer: B
View Text Solution
11. The heats of vaporization of
respectively. The strength of intermolecular forces in these liquids is in
the order of __________.
A.
B.
C.
D.
Answer: A
Watch Video Solution
H2O, C2H5OHandCS2are 40.6 kJmol− 1, 38.6kJmol− 1and26.8kJmol− 1
H2O > C2H5OH > CS2
CS2 > C2H5OH > H2O
H2O > CS2 > C2H5OH
CS2 > H2O > C2H5OH
12. Which one of the following is not correct about liquids ?
A. The intermolecular forces of attraction in a liquid are quite large
B. All liquids are accompanied by cooling on evaporation
C. Lower the boiling point of a liquid greater is its vapour pressure
at room temperature
D. A liquid boils at a higher temperature at the top of a mountain
than at the sea level
Answer: D
Watch Video Solution
13. A closed �ask contains water in all its three states solid, liquid and
vapour at . In this situation, the average kinetic energy of water
molecules will be
A. the greatest in all the three states
B. the greatest in vapour state
C. the greatest in the liquid state
0∘C
D. the greatest in the solid state
Answer: B
Watch Video Solution
14. The critical temperature of water is higher than that of because
the molecule has
A. fewer electrons than
B. two covalent bonds
C. V-shape
D. dipole moment
Answer: D
Watch Video Solution
O2
H2O
O2
15. The approximate temperature at which 1 mol of a sample of
pure ideal gas exhibits a pressure of 101.325 k Pa is
A. 12.2 K
B. 122 K
C. 244 K
D. 300 K
Answer: A
Watch Video Solution
L− 1
16. If the pressure and absolute temperature of 2 litres of are
doubled the volume of would become
A. 2 litres
B. 4 litres
CO2
CO2
C. 5 litres
D. 7 liters
Answer: A
Watch Video Solution
17. The density of methane at 2.0 atmosphere pressure at is
A. 0.13
B. 0.26 g
C. 1.30 g
D. 26.0 g
Answer: C
Watch Video Solution
27∘C
gL− 1
L− 1
L− 1
L− 1
18. The density of a gas at and is . Pressure remaining
constant, at which of the following temperture will its density become
?
A. C
B. C
C. 400 K
D. 300 K
Answer: C
Watch Video Solution
27∘C 1atm d
0.75d
20∘
30∘
19. A vessel is �lled with a mixture of oxygen and nitrogen. At what
ratio of partial pressures will the mass of gases be identical?
A. p = 0.5 p
B. p = p
(O2) (N2)
(O2) (N2)
C. p = 1.14 p
D. p = 0.875 p
Answer: D
Watch Video Solution
(O2) (N2)
(O2) (N2)
20. At constant temperature of at 720 mm and of
at 750 mm presure are put together in a litre �ask. The �nal
pressure of mixture is
A. 735 mm
B. 1470 mm
C. 1095 mm
D. 740 mm
Answer: D
Watch Video Solution
200cm3 N2 400cm3
O2
21. If three unrective gases having partial pressures P and and
theire moles are 1,2 and 3 respectively then their total pressure will be
A.
B.
C.
D. none
Answer: A
Watch Video Solution
PB PC
P = PA + PB + PC
P =PA + PB + PC
6
P =√PA + PB + PC
3
22. The ratio of rates of di�usion of , and is
A.
B.
SO2 O2 CH4
1: √2: 2
1: 2: 4
C.
D.
Answer: A
Watch Video Solution
2: √2: 1
1: 2: √2
23. At what temperature is the . Of a gas molecules half that of its
value at
A. C
B. C
C. 75 K
D.
Answer: C
Watch Video Solution
K. E
27∘C
13.5∘
150∘
−123K
24. The rate of di�usion of two gases X and Y is in the ration of
and that of Y and Z in the ratio of . The ratio of the rate of di�usion
of Z with respecte to X is
A.
B.
C.
D. 30
Answer: D
Watch Video Solution
1: 5
1: 6
:
5/6
1/30
6/5
25. The density of helium is 0.1782 g per litre at N.T.P. Its density at
C and 740mm Hg will be
A. g per litre
27∘
0.1782 × 300 × 760273 × 740
B. g per litre
C. g per litre
D. g per litre
Answer: D
Watch Video Solution
0.1782 × 300 × 740273 × 760
0.1782 × 273 × 740300 × 740
0.1782 × 273 × 740300 × 760
26. When equal weights of and are placed in separate
contaniners of equal volume at the same temerature which of the
following statement is true ?
A. Both �asks cotain the same number of molecules
B. The pressure in oxygen �ask is smaller than the one in the
nitrohgen �ask
C. More molecules are present in the oxygen �ask
O2 N2
D. Molecules in the nitrogen �ask are moving slower on the average
than ones in the oxygen �ask
Answer: B
Watch Video Solution
27. Two �asks X and Y have capacity 1 L and 2 L respectively and each of
them contains 1 mole of a gas. The temperature of the �asks are so
adjusted that average speed of molecules in X is twice as those in Y.
The pressure in �ask X would be
A. same as that in Y
B. half of that in Y
C. twice of that in Y
D. 8 times of that in Y
Answer: D
Watch Video Solution
28. To raise the volume of a gas by four times the following methods
may be adopted. Which of the method is wrong ?
A. T is doubled and P is also doubled
B. Keeping P constant T is raised by four times
C. Temperture is double and pressure is halved
D. Keeping temperature constant pressure is reduced to 1/4 of its
initial value
Answer: A
Watch Video Solution
29. How much should the pressure be increased in order to decrease
the volume of a gas 5% at a constant temprature ?
A. 0.05
B. 0.0526
C. 0.1
D. 0.0426
Answer: B
Watch Video Solution
30. Reducing the pressure from 1.0 to 0.5 atm would change the
number of molecules in one mole of ammonia to
A. 75% of initial value
B. 50% of initial value
C. 25% of initial value
D. None of these
Answer: D
Watch Video Solution
31. In what ratio by mass carbon monoxide and nitrogen should be
mixed so that partial pressure exerted by each gas is same ?
A.
B.
C.
D.
Answer: A
Watch Video Solution
1: 1
1: 2
2: 1
3: 4
32. If the four tubes of a car are �lled to the same pressure with
, and helium separately , then which one will be �lled �rst ?
A.
B.
C.
D. Ne
Answer: C
Watch Video Solution
N2, O2, H2
N2
O2
H2
33. Equal volumes of gases at the same temperature and pressure
contain equal number of particles. This statement is a direct
consequence of
A. Perfect gas law
B. Charles's law
C. Ideal gas equation
D. Partial law of pressure
Answer: C
Watch Video Solution
34. If the speed of gas molecules is at a pressure of
atmospheres, then the speed at a pressure of atmospheres
and constant temperature will be
A. x
B. 2x
C. 4x
D. x/4
Answer: C
rms xcms− 1 p
rms 2p
Numericals
Watch Video Solution
35. Containers and have same, gases. Pressure, volume and
temperature of are all twice that of , then the ratio of number of
molecules of and are
A.
B.
C.
D.
Answer: B
Watch Video Solution
A B
A B
A B
1: 2
2: 1
1: 4
4: 1
1. If of a gas at atmospheric pressue is cooled from to ,
keeping the volume constant, its pressure would become
A. atm
B. atm
C. 2 atm
D. 273 atm
Answer: A
Watch Video Solution
10g 273∘C 0∘C
1
2
1
273
2. In case of Boyle's law, if the pressure is increased by 1% the
percentage decrease in volume is
A. 0.01
B. %100
101
C. %
D. %
Answer: B
Watch Video Solution
1
100
1
100
3. At what temperature in the Celsius scale, V ( volume ) of a certain
mass of a gas at will be doulbed keeping the pressure constant ?
A.
B.
C.
D.
Answer: B
Watch Video Solution
27∘C
54∘
327∘
427∘
527∘
4. At constant pressure,a gas was compressed to half of its volume at
C. To what temperature it should be heated so that its volume
increases to double of its original volume ?
A. C
B. 303 K
C. 240 K
D. 606 K
Answer: D
Watch Video Solution
30∘
60∘
5. Equal volume of two gases which do not react together are enclosed
in separate vessels. Their pressures are 10mm and 400mm respectively.
If the two vessels are joined together, then what will be the pressure of
the resulting mixture (temperature remaining constant)?
A. 125 mm
B. 500 mm
C. 1000 mm
D. 250 mm
Answer: D
Watch Video Solution
6. 160 mL of a gas are collected over water at C and 768.8 mm Hg
A. 760 mm Hg
B. 721.2 mm Hg
C. 600 mm Hg
D.
Answer: A
25∘
View Text Solution
7. Gaseous mixture of contains 56 g of , 44g of and 16 g of
. The total pressure of mixture is 720 mm of Hg . The partial
pressure of is :-
A. 180 mm
B. 360 mm
C. 540 mm
D. 720 mm
Answer: A
Watch Video Solution
N2 CO2
CH4
CH4
8. The Graham's law states that ''at constant pressure and temperature
the rate of di�usion or e�usion of a gas is inversely proportional to
the squar root of its density Rate of di�usion ∝1
√d
If and represent the rates of di�usion of two gases and and
are their respective densities, then
(where n is no of moles)
and
If some moles of di�use in 18 sec and same moles of other gas
di�use in then what is the molecular weight of the unknown gas
? .
A.
B.
C.
D.
Answer: B
h id l i
r1 r2 d1 d2
= √r1
r2
d2
d1
= √ ×r1
r2
M2
M1
P1
P2
= √ = √V1 × t2
V2 × t1
d2
d1
M2
M1
V ∝ n
V1 ∝ n1 V2 ∝ n2
O2
45 sec
× 32452
182
× 32182
452
182
452 × 32
452
182 × 32
Watch Video Solution
9. The rate of di�usion of oxygen as compared with ozone will be
A. 1.5 times
B. 1.22 times
C. 0.66 times
D. 0.82 times
Answer: A
Watch Video Solution
10. If two gases X and Y have their molecules travelling at the velocities
in the ratio of . The ration of their molecular mass will be
A.
B. 9
3: 1 Mx /My
1
9
C. 3
D.
Answer: B
Watch Video Solution
1
3
11. The molecular weight of a gas which di�uses through a porous plug
at of the speed of hydrogen under identical condition is:
A. 27
B. 72
C. 36
D. 48
Answer: C
Watch Video Solution
1/6th
12. The density of a gas A is three times that of a gas B. It the molecular
mass of A is M, the molecular mass of B is
A. 3M
B.
C.
D.
Answer: C
Watch Video Solution
√3M
M
3
M
√3
13. A bottle of cold drink has 200 mL liquid in which is 0.1 molar. If
behaves as ideal gas the volume of at S.T.P. solution of cold
drink is
A. 0.224 litres
CO2
CO2 CO2
B. 0.448 litres
C. 22.4 litres
D. 2.24 litres
Answer: B
Watch Video Solution
14. One day when the temperature and pressure were 300 K and 760
mm a mass of gas had a volume ofg 1200 c.c. On the next day the
volume had changed to 1218 while the pressure was the same .
What was the temperature on the second day ?
A. K
B. K
C. K
D. 300 K
cm3
273∘
31.5∘
31.5∘
Answer: B
View Text Solution
15. A pre weighed vessel was �lled with oxygen at N.T.P. and weighted.It
was then evacuated, �lled with at the same temperature and
pressure, and again weighed. The weight of oxygen will be
A. The same as that of the
B. that of
C. twice that of
D. one fourth that of
Answer: B
Watch Video Solution
SO2
SO2
1
2SO2
SO2
SO2
16. One litre of a gas collected at S.T.P. will occupy ________ at 4
atomosphere and 310 K.
A. litres
B. litres
C. litres
D. litres
Answer: B
Watch Video Solution
1 × ×41
310
273
1 × ×1
4
310
273
1 × ×41
37273
1 × ×41
273310
17. A balloon �lled with methane is pricked with a sharp point and
quickly plunged into a tank of hydrogen at the same pressure. After
sometime, the balloon will have
A. Enlarged
B. Collapsed
C. Remained unchanged in size
D. None of the above
Answer: A
Watch Video Solution
18. A �ask containing methane gas was weighed at a measured
temperature and pressure. The �ask was emptied and then �lled with
oxygen at the same temperature and pressure. The weight of methane
vapour will be about
A. the same as that of oxgen
B. one half as heavy as oxygen
C. one �fth as heavy as oxygen
D. �ve times as heavy as oxygen
Answer: B
View Text Solution
19. A weather balloon �lled with hydrogen at 1 atm and 300K has
volume equal to 12000 litres. On ascending it reaches a place where
temperature is 250K and pressure is 0.5atm. The volume of the balloon
is:
A. 24000 litres
B. 20000 litres
C. 10000 litres
D. 12000 litres
Answer: B
Watch Video Solution
20. A discharge tube of volume 30 was sealed o� during an
experiment at a pressure of atm .at C. The number of
gas molecules remaining in the sealed tube is
A.
B.
C.
D.
Answer: C
View Text Solution
dm3
8.2 × 10− 10 27∘
6.023 × 10− 20
6.023 × 1018
6.023 × 1014
6.023 × 1023
21. A spherical balloon of 18 cm diameter is to be �lled uo with gas at
NTP from a gas cylinder containing the gas at 30 atm. Pressure at
C . If the gas cylinder can hold 3 litres of water the number of balloons
that can be fully �lled is
27∘
A. 400
B. 26
C. 100
D. 50
Answer: B
View Text Solution
22. A cylinder containing cooking gas can withstand a pressure of
. The pressure gauge of the cylinder indicates at .
Due to a sudden �re in the building, the temperature starts rising. At
what temperature will the cylinder explode?
A. 1000 K
B. 375 K
C. 550 K
15atm 12atm 27∘C
D. 225 K
Answer: B
Watch Video Solution
23. An open �ask contains air at C and one atm. Pressure. The �ask
is heated to C at the same pressure . The fraction of original air
remaining in the �ask will be
A.
B.
C.
D.
Answer: D
Watch Video Solution
27∘
127∘
1
5
2
5
1
2
3
4
24. Five grams each of the following gases at and 750 mm
pressure are taken. Which of them will have the least volume ?
A. HF
B. HCI
C. HBr
D. HI
Answer: D
Watch Video Solution
87∘C
25. 10 mL of a gaseous hydrocarbon require 30 mL of oxygen for
complete combustion. The ihydrocarbon is
A.
B.
C2H4
C2H2
C.
D.
Answer: A
View Text Solution
C2H6
C3H8
26. Study the �gures below and identify the type of interaction
between XY-XY molecules.
A. Dipole-Induced dipole
B. Dipole-Dipole
C. Dispersion forces
D. Induced dipole-Induced dipole
Answer: B
Watch Video Solution
27. Atmospheric pressure recorded in di�erent cities are as follows :
Consider the
above data and mark the place at which liquid will boil �rst.
A. Shimla
B. Bhopal
C. Agra
D. Chennai
Answer: A
Watch Video Solution
28. The drain cleaner Drainex contains small bits of aluminium which
react with caustic soda to produce hydrogen What volume of hydrogen
at aand one bar will be released when of aluminium reacts
? .
A. 204 mL
B. 200 mL
C. 203 mL
D. 400 mL
Answer: C
Watch Video Solution
20∘C 0.15g
29. For a real gas the compressibility factor Z has di�erent values at
di�erent temperatures and pressure. Which of the following is not
correct under the given conditions ?
A. at very low pressure
B. at high pressure
C. Z=1 under all conditions
D. Z=1 at intermediate pressure
Answer: C
Watch Video Solution
Z < 1
Z > 1
30. Match the column I with column II and mark the appropriatre
choice.
A. (A) (i), (B) (ii), ( C ) (iv) , (D) (iii)
B. (A) (iii), (B) (i), ( C ) (iv) , (D) (ii)
C. (A) (ii), (B) (iii), ( C ) (i) , (D) (iv)
D. (A) (iv), (B) (ii), ( C ) (iii) , (D) (i)
Answer: B
Watch Video Solution
→ → → →
→ → → →
→ → → →
→ → → →
31. The molecules of a gas are in constant (i) _______ motion . They move
in (ii) ________ lines until they collide with another molecule . The
collisions are perfectly (iii) _________ in nature . A real gas behaves as an
ideal gas at (iv) _________ temperature and (v) _________ pressure .
A. random vertical straight high low
B. straight random elastic low high
C. random straight elastic high low
D. ideal round elastic low high
Answer: C
Watch Video Solution
32. Assertion : At high altitudes liquids boil at lower temperaturers in
comparison to that of sea level.
Reason : At high altitudes atmospheric pressure is low
A. Both assertion and reason are true and reason is the correct
explanation of assertion
B. Both assertion and reason are true and reason is not the correct
explanation of assertion
C. Assertion is true but reason is false
D. Both assertion and reason are false
Answer: A
Watch Video Solution
33. Assertion : Viscosity of liquids decreases as the temperature rises.
Reason : At high temperature molecules have high kinetic energy and
can overcome the intermolecular forces to �ow faster.
A. Both assertion and reason are true and reason is the correct
explanation of assertion
B. Both assertion and reason are true and reason is not the correct
explanation of assertion
C. Assertion is true but reason is false
D. Both assertion and reason are false
Answer: A
Watch Video Solution
34. A graph is plotted between pressure and volume at di�erent
temperature. On the basis of the graph what changes will you observe
in the volume if
(i) the pressure is increased at constant temperature
(ii) the temperature is decreased at constant pressure
A. volume increases in both the cases
B. volume decreases in both the cases
C. volume increases in (i) and decreases in (ii)
D. volume decreases in (i) and increases in (ii)
Answer: B
Watch Video Solution
35. A container of 1 L capacity contains a mixture of 4 g of and 2 g
at . What will be the total pressure of the mixture ?
A. 50.42 atm
B. 25.21 atm
C. 15.2 atm
D. 12.5 atm
Answer: B
Watch Video Solution
O2
H2 0. ∘ C
36. Ideal gas equation is also called equation of states bacause
A. it depends on states of matter
B. it is a relation between four variables and describes the state of
any gas
C. it is combination of various gas laws and any variable can be
calculated
D. it is applicable to ony ideal gases under STP conditions
Answer: B
Watch Video Solution
37. If average velocity of a sample of gas molecules at 300 K is
, what is RMS velocity of sample of gas molecules at the same
temperature ? (Given ,
A. 6.112 cm / s
B. 4.605 cm /s
5cms− 1
α : u : v = 1: 1.224: 1.127)
C. 4.085 cm /s
D. 5.430 cm/s
Answer: D
Watch Video Solution
38. A gases mixture contains oxygen and nitrogen in the ratio by
weight. Therefore, the ratio of the number of molecules is:
A.
B.
C.
D.
Answer: D
Watch Video Solution
1: 4
1: 8
3: 16
1: 4
7: 32
Test Your Grasp
1. Which of the following statements is not correct about the three
states of matter, i.e., solid, liquids and gas?
A. Molecules of a solid possess least kinetic energy whereas those
of a gases possess highest kinetic energy
B. The density of solid is highest whereas theat of gases is lowest
C. Gases like liquids possess de�nite volumes
D. Molecules of a solid possess vibratory motion
Answer: C
Watch Video Solution
2. If is the volume of a given mass of gas at at a constant
pressure then according to Charles' law, the volume at will be
V0 273K
10∘C
.
A.
B.
C.
D.
Answer: D
Watch Video Solution
______________
10V0
(V0 + 10)1
273
V0 +10
273
V0273273
3. In a closed vessel of 5 litres capacity, 1 g of is heated from to
. Which statement is not correct ?
A. Pressure of the gas increases
B. The rate of collision increases
C. The number of moles of gas increases
D. The energy of gaseous molecules increases
O2 300
600K
Answer: C
Watch Video Solution
4. Which of the following is not a correct postulate of kinetic theory of
gases?
A. The molecules of a gas are continuosly moving in di�erent
directions with di�erent velocities
B. The average kinetic energy of the gas molecules is directly
proportional to the absolute temperature of the gas
C. The volume of the gas is due to hitting on the molecules on the
walls of the container
D.
Answer: C
Watch Video Solution
5. The most probable velocity is expressed as
A.
B.
C.
D.
Answer: C
Watch Video Solution
8RTπM
2RTM
( )1 / 2
2RTM
( )1 / 2
3RTM
6. A cylinder is �lled with a gaseous mixture containing equal masses of
and . The partial pressure ratio is:
A.
B.
CO N2
PN2 = PCO
PCO = 0.875PN2
C.
D.
Answer: A
Watch Video Solution
PCO = 2PN2
PCO = 1/2PN2
7. Triple Point
A. C, 1 atm
B. , 4.7 atm
C. C, 4.7 mm
D.
Answer: C
Watch Video Solution
0∘
2∘
0∘
−2∘C, 4.7mm
8. A helium atom is two times heavier than a hydrogen molecule. At
, the average kinetic energy of a helium atom is
A. two times that of a hydrogen molecule
B. same as that of a hydrogen molecule
C. four times that of a hydrogen molecule
D. half that of a hydrogen molecule
Answer: B
Watch Video Solution
298K
9. If gas at is expanded to at constant , then what
is the �nal pressure
A.
B.
C.
20cm3 1atm 50cm3 T
20 ×1
50
50 ×1
20
1 × × 501
20
D. none of these
Answer: A
Watch Video Solution
10. A �ask containing air (open to the atmosphere) is heated from 300
K to 500 K. The preccentage of air escaped to the atmosphere is
A. A �ask containing air (open to atmosphere ) is heated from 300 K
to 500 K. The percentage of air escaped to the atmosphere is
nearly
B. 16.6
C. 40
D. 60
Answer: B
Watch Video Solution
Watch Video Solution
11. When the temperature is raise, the viscosity of liquid decreases, this
is because,
A. Decreased volume of the solution
B. Increases in temperature increases the average kinetic energy of
molecules which overcome the attractive forces between them
C. Decreased covalent and hydrogen bond forces
D. Increased attraction between the molecules
Answer: B
Watch Video Solution
12. If the speed of gas molecules is at a pressure of
atmospheres, then the speed at a pressure of atmospheres
and constant temperature will be
rms xcms− 1 p
rms 2p
A. x
B. 2x
C. 4x
D.
Answer: C
Watch Video Solution
x
4
13. Which factor is most responsible for the increase in boiling points
of noble gases from He to Xe?
A. Decrease in I.E.
B. Monoatomic nature
C. Monoatomic in polarisability
D. Increases in polarisability
Answer: D
Watch Video Solution
14. At of the following does not showexpliently the relationship
between Boyle's law and Charles'law?
A.
B. PV=K
C.
D.
Answer: D
Watch Video Solution
=P1
P2
T1
T2
=P2
P1
V1
V2
= ×V2
V1
P1
P2
T2
T1
15. , v and u represent most probable velocity, average velocity and
root mean square velocity of a gas at a particular temperature.Which
one of the following relationship is correct?
A.
B.
C.
D.
Answer: D
Watch Video Solution
α
α > u > v
u > α > v
v > u > α
u > v > α
16. Which of the following gases will have the highest velocity at
?
A. Oxygen
RMS
25∘C
B. Carbon dioxide
C. Sulphur dioxide
D. Carbon monoxide
Answer: D
Watch Video Solution
17. The temperature at which a real gas obeys the ideal gas laws over a
wide range of pressure is called
A. Critical tempreature
B. Boyle temperature
C. Inversion temperature
D. Reduced temperature
Answer: B
Watch Video Solution
18. A liquid can exist only
A. Between triple point and critical temperature
B. at any temperature above the melting point
C. between melting point and critical temperature
D. between boiling and melting temperature
Answer: D
Watch Video Solution
19. With rise in temperature, viscosity of a liquid
A. increases
B. decreases
C. remains constant
D. May increases or decreases
Answer: B
Watch Video Solution
20. The surface tension of water of is 72.75 dyne . Its value in
SI system is
A. 2.275
B. 0.7275
C. 0.07275
D. None of the above
Answer: C
Watch Video Solution
20∘ cm− 1
Nm− 1
Nm− 1
Nm− 1
21. 8.2 L of an ideal weight 9.0 g at 300 K and 1 atm. pressure. The
molecular mass of gas is
A. 9
B. 27
C. 54
D. 81
Answer: B
Watch Video Solution
22. How many moles of He gas occupy 22.4 litres at and one
atmospheric pressure
A. 0.9
B. 1.11
30∘C
C. 0.11
D. 1
Answer: A
Watch Video Solution
23. The temperature of the gas is raised from to , the root
mean square velocity is
A. times the earlier value
B. same as before
C. halved
D. doubled
Answer: D
Watch Video Solution
27∘C 927∘C
√927/27
24. There is 10 litre of a gas at STP Which of the following new
conditions keep the volume constant?
A. 273 K and 2 atm. Pressure
B. C and 2 atm. Pressure
C. C and 0.5 atm pressure
D. C and 0.0 atm. Pressure
Answer: B
Watch Video Solution
273∘
546∘
0∘
25. According to kinetic theory of gases, for a diatomic molecule
A. the pressure exerted by the gas is proportional to the mean
velocity of the molecules
B. the pressure exerted by the gas is proportional to the root mean
square velocity of the molecules
C. the root mean square velocity is inversely porportional to the
temperature
D. the mean translational kinetic energy of the molecules is
proportional to the absolute temperature
Answer: D
Watch Video Solution
26. The molecular velocities of two gases at same temperature are
and , their masses are and respectively, which of the
following expression is correct ?
A.
B.
u1
u2 m1 m2
=m1
u21
m2
u21
m1u2 = m2u2
C.
D.
Answer: D
Watch Video Solution
=m1
u1
m2
u2
m1u21 = m2u
21
27. A gas is said to behave like an ideal gas when the relation =
constant. When do you expect a real gas to behave like an ideal gas ?
Watch Video Solution
pV
T
28. A sealed tube which can withstand a pressure of 3 atmosphere is
�lled with air at and 760 mm pressure. Find the temperature
above which it will burst.
A. C
B. C
27∘C
900∘
627∘
C. C
D. C
Answer: B
Watch Video Solution
81∘
1173∘
29. Four molecules of a gas have speeds of respectively.
The root mean square velocity is
A.
B.
C. 30
D. 0.15
Answer: A
Watch Video Solution
1, 2, 3, 4cms− 1
√7.5
√30
30. Which of the following is correct ?
A. At altitudes the pressure of air is low
B. At altitudes density of air is low
C. At altitudes cooking takes place slower
D. At altitudes water will boil at a temperature less than C
Answer: C
Watch Video Solution
100∘
31. C rise in temperature is equal to a rise of
A. F
B. F
C. F
D. F
1∘
1∘
9/5∘
5/9∘
33∘
Answer: B
Watch Video Solution
32. The mountaineers carry oxygen gas cylinders with them while
climbing high mountains . Give reasons.
A. Density of air is high at the altitudes
B. Density of air is low at the altitudes
C. Air is less pure at the altitudes
D. Air contains no oxygen at the altitudes
Answer: B
Watch Video Solution
33. The compressibility factor for an ideal gas is .
A. 1.5
B.
C.
D.
Answer: B
Watch Video Solution
1.0
2.0
∞
34. The critical temperature of a substance is de�ned as
A. The temperature above which the substance decomposes
B. the temperature above which a substance can exist only as a gas
C. Melting point of the substance
D. Boiling point of the substance
Answer: B
Watch Video Solution
35. The behaviour of temporary gases like appoaches that a
permanent gases like etc. as we go
A. below critical temperature
B. above critical temperature
C. above absolute zero
D. below absolute zero
Answer: B
View Text Solution
CO2
N2, O2,
36. An ideal gas cannot be liqui�ed because
A. Its critical temperature is always above C
B. Its molecules are relatively smaller in size
0∘
C. it solidi�es before becoming a liquid
D. force operative between its molecules are negligible
Answer: D
Watch Video Solution
37. The relationship between and is
A.
B.
C.
D.
Answer: D
Watch Video Solution
PC, VC TC
PCVC = RT
PCVC = 3RTC
PCVC = RTC
3
5
PCVC = RTC
3
8
38. On heating a liquid its surface tension
A. increases
B. decreases
C. remans same
D. Is reduced to zero
Answer: B
Watch Video Solution
39. At what temperature will both the Celsius and Fahrenheit scales
read the same value?
A. C
B. F
C. C
D. C
0∘
32∘
−40∘
40∘
Answer: C
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40. Which of the following statements is correct about a liquid at
constant temperature before equilibrium is attained ?
A. Rate of evaporation ( decreases with time whereas rata of
condesation increases with time
B. increases with time where increases with time
C. remains constant whereas increases with time
D. remains constant whereas decreases with time
Answer:
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Re)
(Rc)
Re Rc
Re Rc
Rc Re
41. If a gas expands at constant temperature
A. the pressure increases
B. the K.E. of the molecules remains the same
C. the K.E. of the molecules decreases
D. the number of molecules of gas decreases
Answer: B::C
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42. The equation representing Gay - Lussac 's law is
A.
B.
C.
D.
P1 × T2 = P2 × T1
V1 × T2 = V2 × T1
P1 × T1 = P2 × T2
P1 × d2 = P2 × d1
Answer: A
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43. The strength of dispersion forces does not increases with increases
in
A. size of molecules
B. molar mass
C. no. of protons
D. no. of neutrons
Answer: D
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44. Which of the following is applications of surface tension ?
A. Capillary action
B. Cleansing action of soap
C. Spherical shape of liquid drop
D. All of these
Answer: D
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45. Dipole moment is de�ned as the product of charge and the
A. distance between the charges
B. square of distantce between the charges
C. square root of distance between the charges
D. half of the distance between the charges
Answer: A
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46. ______ modi�ed Linde process such that the cooling becomes more
e�cient.
A. Claude
B. Joule
C. Thomson
D. Boyle
Answer: A
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47. Liquds which are more volatile have ________ forces of attraction.
A. strong intramolecular
B. weak intramolecular
C. weak intermolecular
D. strong inermolecular
Answer: C
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48. Which of the following value of R is not correct ?
A. 8.314 J .
B. 0.0821 L . Atm .
C. 1.987 cal .
D. 0.239 cal .
Answer: D
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K− 1. Mol − 1
K − 1mol − 1
K − 1. mol − 1
K − 1. mol − 1
49. SI unit of pressure is
A. Nm
B.
C.
D.
Answer: C
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Nm− 1
Nm2
mN − 2
50. Hydrogen bonding is a particularly strong type of …… interaction
A. dipole - dipole
B. dipole - induced dipole
C. ion-dipole
D. ion-ion